CN104393907B - A kind of satellite communication method - Google Patents
A kind of satellite communication method Download PDFInfo
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- CN104393907B CN104393907B CN201410675619.2A CN201410675619A CN104393907B CN 104393907 B CN104393907 B CN 104393907B CN 201410675619 A CN201410675619 A CN 201410675619A CN 104393907 B CN104393907 B CN 104393907B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0417—Feedback systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
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- Computer Networks & Wireless Communication (AREA)
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- Astronomy & Astrophysics (AREA)
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Abstract
The invention discloses a kind of satellite communication methods, for realizing the transmission of N number of channel data between satellite and master controller.The satellite equipped with transmitting terminal on star and satellite reception end, the master controller equipped with transmitting terminal corresponding M ground station reception end on the star and M earth station transmitting terminal corresponding with the satellite reception end.Transmitting terminal has M transmitting antenna for being respectively directed to M ground station reception end and is directed toward M reception antenna of M earth station's transmitting terminal on the star, and each earth station also corresponds to transmitting terminal on the star and identical 1 reception antenna and 1 transmitting antenna is arranged with satellite reception end.The star of multiple channel datas is carried out the present invention relates to the technological approaches being combined using spatial reuse, frequency division multiplexing and polarization multiplexing feeding transmission, relatively traditional time division multiplexing and code division multiplexed transmission mode, it is simple for structure to be illustrated, not complicated Digital Signal Processing and high-precise synchronization demand, it is easily achieved, it is reliable and stable.
Description
Technical field
The present invention relates to the transmission means in satellite communication, specifically a kind of satellite communication method is related to spatial reuse, frequency
Point multiplexing and the transmission method that is combined of polarization multiplexing, its object is to ensure Large Volume Data in star to have between feeding link
Effect transmission, can be used as the multiple fields such as satellite communication, observing and controlling.
Background technology
The characteristics of satellite communication based on ground digital Wave beam forming be star feeding link need to transmit it is all logical on star
The data in road, data volume are larger.In addition, due to star wireless channel atmospheric environment, electromagnetic environment are complicated, channel distortion can be made,
It is required that penalty caused by distortion meets index request；Due to the limitation of cost, performance, it is desirable that On-Star system reduces complicated
Degree；It due to star feeds and there is a problem of what frequency resource was limited, should rationally reduce bandwidth demand.It solves to be based on ground digital wave beam
The satellite communication system star of formation feeding link big data quantity information it is effective transmission should consider any of the above factor, root
According to application scenarios, physical condition, best selection is made.
The signal timesharing of common time division multiplexing (TDM) transmission system, multiple channels through star feeds wireless channel transmission.
Either forward link or return link, synchronization only pass the data in a channel.This transmission method is the disadvantage is that star
On need control device and synchronizer, synchronization accuracy requires high, and Digital Signal Processing amount is big and complicated.
For code division multiplexing (CDM) transmission system, the signal in different channels carries out band spectrum modulation transmission with different pseudo-codes,
It is handled in one group of identical pseudo-code despreading of receiving terminal, recovers each channel information.The shortcomings that this method is transmitting terminal needs
Increase spread-spectrum signal processing equipment, meanwhile, receiving terminal needs to increase spread-spectrum signal despreading equipment, entire communication system signal processing
Complexity, and CDM is unfavorable for realizing there are multi-access inference.
Invention content
Satellite communication system based on ground digital Wave beam forming needs to transmit all port numbers on star there are feeding link
According to challenge, traditional TDM and CDM transmission methods, that there are Digital Signal Processing is complicated, synchronization accuracy is high, control is complicated asks
Topic, in order to solve this problem, the present invention proposes a kind of satellite communication method.
The invention is realized in this way a kind of 1. satellite communication methods, for realizing between satellite and master controller
N number of channel data transmission, each channel data bandwidth is all mutually m MHz, and the satellite is equipped with transmitting terminal on star and satellite
Receiving terminal, the master controller equipped with transmitting terminal corresponding M ground station reception end on the star and with the satellite reception
Hold corresponding M earth station transmitting terminal；Transmitting terminal has M transmitting day for being respectively directed to M ground station reception end on the star
Line and M reception antenna for being directed toward M earth station's transmitting terminal, each earth station also correspond to transmitting terminal and satellite reception end on the star
Identical 1 reception antenna and 1 transmitting antenna are set；The satellite communication method includes the following steps：
N number of channel data is divided into N/M channel data successively and is respectively allocated to M transmitting antenna；Each transmitting day
N/M channel data on line is equally divided into two groups successively again, every group of a channel data of N/ (2M)；Preceding N/ (2M) a port number
After carrying out frequency division multiplexing, it is modulated to center frequency point f respectively1On+i Δs, wherein f1For initial frequency, i=0,1 ..., N/
(2M) -1, Δ are side frequency interval；After a channel datas of rear N/ (2M) are carried out frequency division multiplexing, it is modulated to center frequency point respectively
f1On+Δ/2+i Δs；After two groups of frequency-division multiplex singals of the same transmitting antenna of correspondence are carried out up-conversion radio frequency processing respectively,
Corresponding transmitting antenna is sent into be emitted；
After each reception antenna receives two groups of transmitting signals of corresponding transmitting antenna, it is filtered, amplifies respectively, frequency conversion is penetrated
Frequency is handled；Then N/ (2M) a channel data is respectively obtained after carrying out solution frequency division multiplexing respectively, amounts to N/M channel data.
As being further improved for said program, each channel data frequency point interval stick signal isolation bandwidth.
As being further improved for said program, the transmitting antenna and the reception antenna are dual polarized antenna, this is bipolar
It is horizontal polarization signals to change antenna to take the half channel data of corresponding N/M channel data, the other half channel data is vertical pole
Change signal.
Compared with prior art, the invention has the advantages that：
1, the present invention uses the transmission mode of frequency division multiplexing, by by the frequency spectrum shift of different channel signals to non-overlapping copies
Frequency band in realize that channeling is compared with TDM with CDM transmission modes, do not need at complicated synchronizer, spread spectrum and despreading
Digital signal processing appts, the control devices such as reason etc., reduce the complexity of system；
2, the method for frequency division multiplexing of the present invention, being different from TDM and CDM multiplex modes can only realize that frequency division is multiple in numeric field
With can both be realized on numeric field, can also be realized on analog domain；
3, the present invention uses space division+frequency division+polar transmission system so that system bandwidth greatly reduces, hence it is evident that reduces and is
The demand united to frequency spectrum resource.
Description of the drawings
Fig. 1 is the frame diagram of satellite communication method of the present invention；
Fig. 2 is 5 channels of the present invention frequency division multiplexing figure；
Fig. 3 is horizontal polarization of the present invention and vertical polarization schematic diagram；
Fig. 4 is polarization multiplexing schematic diagram of the present invention；
Fig. 5 is the expander graphs of the frame diagram of satellite communication method of the present invention.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The present invention satellite communication method for realizing N number of channel data between satellite and master controller transmission,
Each channel data bandwidth is all mutually m MHz, which matches equipped with transmitting terminal on star and satellite reception end, the master controller
Have M ground station reception end corresponding with transmitting terminal on the star and M earth station corresponding with satellite reception end hair
Penetrate end；Transmitting terminal has M transmitting antenna for being respectively directed to M ground station reception end and is directed toward M earth station's transmitting on the star
The M reception antenna at end, each earth station also correspond to transmitting terminal on the star and identical 1 reception antenna are arranged with satellite reception end
With 1 transmitting antenna.
The transmitting antenna and the reception antenna are dual polarized antenna, which takes corresponding N/M channel data
Half channel data be horizontal polarization signals, the other half channel data be vertical polarization signal.
The satellite communication method includes the following steps.
One：N number of channel data is divided into N/M channel data successively and is respectively allocated to M transmitting antenna；Each transmitting
N/M channel data on antenna is equally divided into two groups successively again, every group of a channel data of N/ (2M)；A channel preceding N/ (2M)
After data carry out frequency division multiplexing, it is modulated to center frequency point f respectively1On+i Δs, wherein f1For initial frequency, i=0,1 ..., N/
(2M) -1, Δ are side frequency interval；After a channel datas of rear N/ (2M) are carried out frequency division multiplexing, it is modulated to center frequency point respectively
f1On+Δ/2+i Δs；After two groups of frequency-division multiplex singals of the same transmitting antenna of correspondence are carried out up-conversion radio frequency processing respectively,
Corresponding transmitting antenna is sent into be emitted.Each channel data frequency point interval stick signal isolation bandwidth.
Two：After each reception antenna receives two groups of transmitting signals of corresponding transmitting antenna, it is filtered, amplifies, becomes respectively
Frequency radio frequency processing；Then N/ (2M) a channel data is respectively obtained after carrying out solution frequency division multiplexing respectively, amounts to N/M port number
According to.
Subsequently carry out detailed illustration.
Embodiment 1：
One embodiment of the present of invention is satellite, and there are 20 channel datas to need to be transferred to ground, each channel data band
Width is all mutually 6MHz, has two emitting antennas on star, earth station 1 and earth station 2 is respectively directed to, referring to Fig. 1.On star first
First 10 in 20 channels are distributed to transmitting antenna 1, and transmitting antenna 2 is distributed to for 10 after；Then, 10 on antenna 1
A channel is equally divided into two groups again, and preceding 5 channel signals are carried out frequency division multiplexing by every group of 5 channels using frequency division multiplexing 1, point
It is not modulated to center frequency point (f1+ i Δs, i=0,1 ..., 4) on, consider that the frequency band protection interval between signal, Δ are taken as
10MHz, 5 channel signals carry out frequency division multiplexing using frequency division multiplexing 2 after, in order to increase the isolation of two groups of signals, after
Five channels are modulated to center frequency point (f respectively1+ Δ/2+i Δs, i=0,1 ..., 4) on, finally two groups of frequency-division multiplex singals
The radio frequency processings such as up-conversion are carried out, horizontal and vertical transmitting dual polarized antenna 1 is then fed into and is emitted；Afterwards 10 channels also into
The same processing of row, is emitted in horizontal and vertical transmitting dual polarized antenna 2；The reception dual polarized antenna 1 of earth station 1 receives
The signal of transmitting antenna 1 is filtered horizontal and vertical polarized signal, amplifies, the radio frequency processings such as frequency conversion, then carrying out respectively
Frequency division multiplexing is solved, the signal in 5 channels is respectively obtained, amounts to the signal in 10 channels；Meanwhile the reception dual polarization of earth station 2
Antenna 2 receives the signal for emitting dual polarized antenna 2 on star, is filtered, amplifies respectively to horizontal and vertical polarized signal, frequency conversion
Etc. radio frequency processings, then carry out solution frequency division multiplexing, respectively obtain the signal in 5 channels, amount to 10 channels signal；Finally,
The channel signal of Liang Ge earth stations is sent into master controller, and master controller can obtain the signal in 20 channels.
Frequency domain distribution of the signal in 5 channels after frequency division multiplexing 1 is as shown in Fig. 2, each channel center in this system
Frequency point is spacedly distributed, and adjacent frequency interval 10MHz, signal bandwidth 6MHz, there are the protection intervals of 4MHz.This system enters hair
Penetrate the signal spectrum distribution map of two polarization directions of dual polarized antenna 1 as shown in figure 3, two polarization directions signal center's frequency
Point difference 5MHz, can reach better isolation effect.Horizontal and vertical polarized signal is multiplexed using polarizer, as shown in Figure 4.
The frequency resource that the transmission of 20 channel datas of this system occupies is 51MHz, the total bandwidth of far smaller than 20 channel datas
120MHz。
When this system uses frequency division multiplexing, either multi channel signals are combined into all the way in transmitting terminal, or is receiving
Signal all the way, is reverted to original multiple channel signals, multiple local frequency points is required for realize multichannel by end solution channeling
Signal spectrum is moved.In order to reduce the influence of Doppler frequency shift, on star and the local frequency on ground uses same benchmark.
Opposite TDM and CDM multiplex modes, the present embodiment use the Novel Delivery of spatial reuse+frequency division multiplexing+polarization multiplexing
System, realization is simple for structure to be illustrated, and system structure is simple, not complicated Digital Signal Processing and high-precise synchronization demand, easily
Reliable and stable in realization, suitable for star electric feed signal is transmitted.
Embodiment 2：
An alternative embodiment of the invention is feeding link fl transmission, and 3 are shared on star and is directed toward connecing for Different Ground station
Antenna is received, ground has 3 earth stations, ground to share 180 channel datas and need to be transferred on star, each channel data bandwidth phase
It is all 10MHz, referring to Fig. 5.180 channels are averagely allocated to 3 earth stations, each earth station by ground master controller first
The data information for being responsible for 60 channels is sent；60 channels are equally divided into two groups by earth station 1 again, every group of 30 channels, before
1. 30 channel signals carry out frequency division multiplexing using frequency division multiplexing, be modulated to center frequency point (f respectively1+ i Δs, i=0,1 ...,
29) on, consider the frequency band protection interval between signal, Δ is taken as 15MHz, after 30 channel signals use frequency division multiplexing 2. into
Row frequency division multiplexing, in order to increase the isolation of two groups of signals, five channels are modulated to center frequency point (f respectively after1+Δ/2+i
Δ, i=0,1 ..., 29) on, two groups of frequency-division multiplex singals are finally carried out the radio frequency processings such as up-conversion, are then fed into earth station
1. horizontal and vertical transmitting dual polarized antenna 1. emitted；Earth station is 2. with earth station 3. respectively to 60 affiliated channels
Data carry out and 1. earth station is similarly handled, and use respective transmitting dual polarized antenna to satellite launch；Satellite reception end
Reception dual polarized antenna 1. receive the signal of earth station 1., horizontal and vertical polarized signal is filtered respectively, is amplified,
Then the radio frequency processings such as frequency conversion carry out solution frequency division multiplexing, respectively obtain the signal in 30 channels, amount to the signal in 60 channels；
Meanwhile 2. the reception dual polarized antenna at satellite reception end receives the signal of earth station 2., to horizontal and vertical polarized signal point
It is not filtered, amplifies, the radio frequency processings such as frequency conversion, then carrying out solution frequency division multiplexing, respectively obtain the signal in 30 channels, amounting to
The signal in 60 channels；Meanwhile 3. the reception dual polarized antenna at satellite reception end receives the signal of earth station 3., to horizontal and
The radio frequency processings such as vertical polarization signal is filtered, amplifies respectively, frequency conversion, then carry out solution frequency division multiplexing, respectively obtain 30
The signal in channel amounts to the signal in 60 channels；Finally, the signal in 180 channels is obtained in rear end on star.
The relationship of frequency division multiplexing schematic diagram and dual polarization frequency division multiplexing in this system can simply be deduced by embodiment 1
It obtains, repeats no more.The use of the frequency resource that 180 channels occupy is transmitted after the present invention program is 452.5MHz, far smaller than
The total bandwidth in 180 channels is 1.8GHz, and frequency resource needed for this programme greatly reduces.
When this system uses frequency division multiplexing, either multi channel signals are combined into all the way in transmitting terminal, or is receiving
Signal all the way, is reverted to original multiple channel signals, multiple local frequency points is required for realize multichannel by end solution channeling
Signal spectrum is moved.In order to reduce the influence of Doppler frequency shift, on star and the local frequency on ground uses same benchmark.
Opposite TDM and CDM multiplex modes, the present embodiment use the Novel Delivery of space division multiplexing+frequency division multiplexing+polarization multiplexing
System, realization is simple for structure to be illustrated, and system structure is simple, not complicated Digital Signal Processing and high-precise synchronization demand, easily
Reliable and stable in realization, suitable for star electric feed signal is transmitted.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (2)
1. a kind of satellite communication method, for realizing the transmission of N number of channel data between satellite and master controller, each
Channel data bandwidth is all mutually m MHz, the satellite equipped with transmitting terminal on star and satellite reception end, the master controller equipped with
With transmitting terminal corresponding M ground station reception end on the star and M earth station transmitting terminal corresponding with the satellite reception end；
Transmitting terminal has M transmitting antenna for being respectively directed to M ground station reception end and is directed toward the M of M earth station's transmitting terminal on the star
A reception antenna, each earth station also correspond to transmitting terminal on the star and identical 1 reception antenna and 1 are arranged with satellite reception end
Transmitting antenna；It is characterized in that：The satellite communication method includes the following steps：
N number of channel data is divided into N/M channel data successively and is respectively allocated to M transmitting antenna；On each transmitting antenna
N/M channel data be equally divided into two groups successively again, every group of a channel data of N/ (2M)；Preceding N/ (2M) a channel data into
After row frequency division multiplexing, it is modulated to center frequency point f respectively1On+i Δs, wherein f1For initial frequency, i=0,1 ..., N/ (2M) -1,
Δ is side frequency interval；After a channel datas of rear N/ (2M) are carried out frequency division multiplexing, it is modulated to center frequency point f respectively1+Δ/2
On+i Δs；After two groups of frequency-division multiplex singals of the same transmitting antenna of correspondence are carried out up-conversion radio frequency processing respectively, it is sent into phase
Transmitting antenna is answered to be emitted；
After each reception antenna receives two groups of transmitting signals of corresponding transmitting antenna, it is filtered, amplifies respectively, at conversion radio frequency
Reason；Then N/ (2M) a channel data is respectively obtained after carrying out solution frequency division multiplexing respectively, amounts to N/M channel data；
Transmitting antenna and reception antenna are dual polarized antenna, which takes corresponding N/M channel data, a hemichannel
Data are horizontal polarization signals, the other half channel data is vertical polarization signal.
2. satellite communication method as described in claim 1, it is characterised in that：Each channel data frequency point interval stick signal every
From bandwidth.
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| CN105680887A (en) * | 2016-01-11 | 2016-06-15 | 中国电子科技集团公司第十研究所 | Multiuser polarization modulation wireless communication transmitter |
| CN105744534B (en) * | 2016-01-20 | 2020-03-24 | 任柏松 | FDD-LTE pilot frequency networking method based on frequency migration |
| CN105915264B (en) * | 2016-05-20 | 2018-05-22 | 中国电子科技集团公司第十研究所 | The method of the double spread-spectrum code signals of multiplexing SMA links |
| CN106230494A (en) * | 2016-07-21 | 2016-12-14 | 武汉芯泰科技有限公司 | A kind of polarization frequency-division multiplexing method, Apparatus and system |
| CN108683447B (en) * | 2018-04-09 | 2021-02-19 | 中国电子科技集团公司第三十八研究所 | Method and system for eliminating Doppler frequency difference of forward feed link in satellite communication |
| CN108964741B (en) * | 2018-06-15 | 2021-07-20 | 上海卫星工程研究所 | Satellite-borne X-frequency-band high-speed data transmission system |
| CN111464228B (en) * | 2020-03-18 | 2020-12-15 | 上海航天电子通讯设备研究所 | Multichannel VDES receiving and dispatching preprocessing system based on satellite-borne DBF |
| CN112272052B (en) * | 2020-10-13 | 2022-04-19 | 中国人民解放军63921部队 | Equipment and method for multiplexing pseudo codes of large-scale satellite constellation |
| CN113092878B (en) * | 2021-03-31 | 2023-01-20 | 北京环境特性研究所 | Test method and detection device for electromagnetic radiation of W-band environment |
| CN113660025B (en) * | 2021-07-21 | 2022-08-12 | 中国空间技术研究院 | High-flux satellite beam frequency adjusting method based on central frequency point fixation |
| CN116073929B (en) * | 2023-03-17 | 2023-06-09 | 湖南迈克森伟电子科技有限公司 | Data detection method in MIMO satellite communication system |
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